Messages in this thread | | | Subject | Re: [PATCH v11 00/25] mm/gup: track dma-pinned pages: FOLL_PIN | From | John Hubbard <> | Date | Mon, 6 Jan 2020 17:26:16 -0800 |
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On 1/6/20 1:01 AM, Jan Kara wrote: ... >> Also, looking ahead: >> >> a) if the problem disappears with the latest above test, then we likely have >> a huge page refcount overflow, and there are a couple of different ways to >> fix it. >> >> b) if it still reproduces with the above, then it's some other random mistake, >> and in that case I'd be inclined to do a sort of guided (or classic, unguided) >> git bisect of the series. Because it could be any of several patches. >> >> If that's too much trouble, then I'd have to fall back to submitting a few >> patches at a time and working my way up to the tracking patch... > > It could also be that an ordinary page reference is dropped with 'unpin' > thus underflowing the page refcount... > > Honza >
Yes.
And, I think I'm about out of time for this release cycle, so I'm probably going to submit the prerequisite patches (patches 1-10, or more boldly, 1-22), for candidates for 5.6.
thanks, -- John Hubbard NVIDIA
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